A newly released study on the ExxonMobil pipeline that ruptured in Faulkner County says the pipeline industry knew about manufacturing defects for decades.

It was reported Thursday that the technical report on the Pegasus pipeline shows that other pipelines manufactured around the same time are also susceptible to failure.

Republican U.S. Rep. Tim Griffin told the newspaper that ExxonMobil officials told him that its own testing of the pipeline didn't reveal any problems. The company evaluated the pipeline to detect cracks in February, and the pipeline ruptured in March, forcing about 20 families from their homes.

ExxonMobil didn't immediately respond to questions from the paper and The Associated Press.

The pipeline is more than 60 years old and the study says problems were identified in 1989.